* {
    margin: 0;
    padding: 0;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}

html {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 16px;
}

body {
    min-height: 100vh;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
}

main {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    background-color: #708090;
    border: 1px solid #000;
    width: 100%;
}

.height100 {
    height: 100px;
}
.purple {
    background-color: purple;
}
.blue {
    background-color: blue;
}
.darkblue {
    background-color: #00008b;
}
.black {
    background-color: #000;
}

nav {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-pack: justify;
    -ms-flex-pack: justify;
    justify-content: space-between;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    padding: 1rem;
    width: 100%;
    height: 48px;
    position: fixed;
    top: 0;
    border-bottom: 1px solid #fff;
    z-index: 2;
    background-color: #000;
    color: #fff;
}

section {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    width: 100%;
    height: 100vh;
    z-index: 1;
    padding-top: 48px;
}

/* Depending on the view example (1, 2, or 3), 
you will want to set display:none for the other two 
and display:flex for the example you want to see. */
.view1 {
    display: -webkit-box;
    display: -ms-flexbox;
    display: none;
    -webkit-box-orient: horizontal;
    -webkit-box-direction: normal;
    -ms-flex-direction: row;
    flex-direction: row;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
    -webkit-box-pack: space-evenly;
    -ms-flex-pack: space-evenly;
    justify-content: space-evenly;
    background-color: #d3d3d3;
    color: #000;
}

.view1 div {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    width: 100px;
    height: 100px;
    background-color: #000;
    color: #fff;
    margin: 10px;
}

.view2 {
    display: -webkit-box;
    display: -ms-flexbox;
    display: none;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    display: none;
    color: #fff;
    max-width: 400px;
    max-height: 60%;
    padding-top: 0;
}

.view2 div {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    width: 200px;
    height: 200px;
    color: #fff;
    margin: 10px;
}

.view3 {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    display: none;
    background-color: #d3d3d3;
    border: 1px solid #000;
    max-width: 400px;
    padding: 2rem;
}

.view3 form label {
    color: #000;
    margin-right: 1rem;
    font-size: 1.5rem;
}

.view3 form input {
    width: 100%;
    line-height: 1.5rem;
    font-size: 1.5rem;
}

.view3 form button {
    display: block;
    margin-top: 1rem;
    margin-left: auto;
    font-size: 1.25rem;
    padding: 0.75rem;
    border-radius: 10px;
}